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This isnt not a signal/broadcasting issue, who advised you this issue was in relation to your installation?
Do you have the TV connected to the internet\wifi, and has the TV be updated to the latest firmware?
Ok, and you have good signal and picture quality when watching TV its just the guide which is failing?
The challenge you have is with intermittent faults the service centre probably tried it a couple of times the fault wasn't present so assumed its your local setup.
IS the TV connected to the internet?
It may be with disconnecting the network connection to TV, and seeing if the fault occurs.
Ive seen some instances where the internet connection can cause these problems, once we know its linked we can then direct the service centre to the fault.
How often do you see the issue?
Ok disconnect the WIIF run it for rest of the week and see if the fault is clear, if it is then we know its related to the WIFI. However if it does reoccure after a day no need to wait for the reset of the week, you can reconnect the WIFI and can ask Panasonic to replace the main board which contains the tuner.
Its a difficult one, it does sound like the TV is being overwhelmed by either not being able to get the data from the internet (which is timing out) or the processor just locking up.
Have a go switching the TV off at the wall each day, with the internet connected and see if the fault occurs. I again appreciate its not a sustainable fix, but if that resolves the issue it will be the main board or at least the software running on it is causing the fault.
That would be a possible reason, especially if the TV has had a new main board.
Let me know how you get on over the weekend.
OK, this does suggest the fault is with the TV processor, I would go back and ask that they run a test of 3-4 days with the unit connected to their internet and see if they can replicate it.
As with most intermittent issues unless they can replicate it is a real challenge, however the network adaptor, processor and software are all mounted on the main board so it has to be that which is at fault.
Great, it must be a specific fault on that TV. As with most intermittent issues its a real challenge. Glad you got your refund.
Do you require anything further?